From Longman Dictionary of Contemporary Englishopineo‧pine /əʊˈpaɪn $ oʊ-/ verb [transitive] formal SAYto say what your opinion is about somethingopine that The headmistress opined that the trip would make a nice change.→ See Verb table
Examples from the Corpus
opine• I recall Sir chose swan, a very wise choice for Sir to make, if I might opine.• More likely, Hecataeus opined, he drove them from Epirus, a few hundred miles north.• He opined that B's confession was unreliable; no rebuttal medical evidence was called by the Crown.• I opined that it would certainly be dramatic, if un-presidential.• Alf opined that it would probably be a choice between fish cakes and cheese pie.• On his way out of town, Steve Forbes was programmed to opine that the race has become him versus Dole.• "This project is great news for Tucson, " opined the Mayor.• Some fields get disproportionate funds, he opined, while others go hungry.opine that• He opined that B's confession was unreliable; no rebuttal medical evidence was called by the Crown.• I opined that it would certainly be dramatic, if un-presidential.• Alf opined that it would probably be a choice between fish cakes and cheese pie.• The headmistress opined that the outing would make a nice change for Flora.• On his way out of town, Steve Forbes was programmed to opine that the race has become him versus Dole.• Wrangham opines that while attacks on a possessor are rarely successful, such harassment often prevents eating.Origin opine (1400-1500) French opiner, from Latin opinari “to have an opinion” 